Heating vessel



FIG. 1 is a perspective view of a heating vessel with support showing our new design, the article shown in FIG. 1 is the same when it is rotated 120 degrees in either a clockwise or counterclockwise direction about its vertical axis. The details shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a heating vessel, as shown and described. 